US2426773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tempering process for steel objects
Assignee: Individual
•
Filing: 1942-02-13
•
Granted: 1947-09-02
•
Expires: 1962-02-13
Abstract
No abstract record available.
Inventors
- 👤 Artemas F Holden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:06
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/34; C21D1/44; C21D1/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1799945A
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US1989884A
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GB494842A
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US2174867A
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US2169008A
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US2237434A
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US2231009A
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US2264431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-01 | 1951-03-03 | 1951-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-01 | 1955-03-03 | 1955-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-01 | 1959-03-03 | 1959-09-02 | $7700.00 | Window Closed / Lapsed |